Fix for messages throwing an error if a new GameObject is added to the scene by a message handler
Added BroadcastMessage that targets a specific GameObject and asscociated tests
Added fix Adam suggested to ensure that all components that can recieve a message within a game object are called as well as some tests to make sure that functionality works
Merge branch 'master' of https://github.com/FlaxenFlash/duality into FlaxenFlash-master
Tweaked Broadcast message for style conventions.